Measurement Test

HONESTLY, I found the measurement test to be quite difficult. The test included dimensional analysis, a bit from Nomenclature, and a lot about significant digits. Remember that with significant digits, multiplication/division and addition/subtraction have different rules, and they can be difficult to follow when there is a large problem concerning the order of operations. Also, with dimensional analysis, be careful when you have a measured amount. I ran into trouble last night because I was rounding when I shouldn't have been on my Last Meal Conversion Project, and when you're using specific amounts, as in a recipe, you can't make things up. Make sure you're careful, and I'm praying for everyone else that says they also struggled with the exam today.

QUIZ

Our Measurement quiz went quite well, we are expecting a lot of As and Bs this time around. The significant figures questions were really tricky because you had to pay close attention to what was going on. There are different rules for multiplying/dividing and adding/subtracting, so when the order of operations was to be used, you really have to pay attention. Good luck to everyone expecting their grades soon!! 

Dimensional Analysis

Dimensional Analysis

Summation of Yesterday's Notes

DIMENSIONAL ANALYSIS

-Convert 1 quantity to another

Infinite Sig Figs occur when

-you have a counted quantity

-you have an exact measurement

NEVER START WITH A CONVERSION FACTOR

UNITS HAVE TO CANCEL LEFT TO RIGHT

Ex:

      8.00 m           100 cm           1 in     

    _______    x   ________  x  _______  =    315 inches

        1                    1 m              2.54 cm

Extra Notes:

Temperature: Average Kinetic Energy of the particles in a sample

K='C + 273.15

In Kelvin temperatures, there is no negative.

0 energy = 0 temperature

'F= 9/5 ('C) +32

'C= 5/9 ('F-32)

Significant Figures

Significant Figures...

So, today in the wonderful world of pre-ap chemistry, we learned all about significant figures. It's actually not as hard as it looks... once you finally get it down. Allow me to explain.


Rule #1) You can estimate 1 digit past the calibration on the instrument used.
Rule #2) understand that significant digits indicate accuracy, not quantity.
Rule #3) When rounding, round 4 and below down, and 5 or above up.
Rule #4) The last digit in a measurement is ALWAYS uncertain.

Learning Through Example...

500 mL
Has 1 significant digit... the 5

560 mL
Has 2 significant digits, the 5 and the 6

555.5
Has 4 significant digits.

0.004004500

The First zero before the decimal place, 0.004004500 is not significant, it is only there to show that the larger number is a decimal.
The two zeros following the decimal, 0.004004500 are not significant, and their only purpose is to hold the place for the larger number as a decimal.
The remaining numbers are significant, but we will focus on these for now. 0.004004500, the two 4's and the 5 are significant because they are actually digits.
The two zeros that are locked in between the numerals, 0.004004500, are significant because of their position in being locked in.
The two zeros trailing at the end of the number, 0.004004500 are significant because they show accuracy within the number.

Comment if you have questions!! It's a little confusing at first, but the more examples, the better!!




References:
(n.d.). Retrieved October 23, 2015, from https://jahschem.wikispaces.com/file/view/sig-figs-examples.png/445639706/sig-figs-examples.png

My Stuffed Mole

My Stuffed Mole
For our Mole Day project, I created a stuffed mole. His name is Penelope, and he has a pink pom-pom for a nose. Unfortunately, his mermaid costume will not be complete until later in the month. Please enjoy this photo of my mole interrupting a study session in Chemistry class.

Aspirin Lab Group 2

Group 2 Aspirin Lab
For the second group of the Aspirin Lab, we had one group that tested into the lab. Hopefully they pull through for the rest of us and make enough aspirin for the rest of our labs. When making aspirin, the mixture should be left in the boiling water for 15 minutes, and ICE water must be added to the reaction mixture after it cools for 3 minutes. This is because the warmer the water, the faster the reaction will occur. For a controlled reaction, adding ICE water will be fast and will also not explode all over and kill us all. Be Safe and wear goggles if you are participating in lab!

Beginning of Mole Day

The Beginning of My Mole Day Make-A-Mole

I'm really excited about the Mole Day mole project. October 23 is Mole Day, and we are making stuffed Moles to celebrate. My Mole is going to be a pun-based Little Mole-Maid. My stuffed mole is going to have a pink pom pom nose and pink felt feet. I purchased fabric that is similar to animal fur, so my mole is not necessarily going to be realistic, but maybe it will at least feel realistic. My mole is going to have a detachable wig and mermaid tail for its Halloween costume and Mole-Day theme. I can't wait to finish up this project! Happy almost Mole Day.

European Mole, courtesy of: (n.d.). Retrieved October 6, 2015, from http://designoneinc.com/wp-content/uploads/2013/12/european_mole_2.jpg

Aspirin Lab Group 1

Group 1 Aspirin Lab
Nobody in group 1 passed the pre-lab quiz. The first round of the aspirin lab was therefore not conducted. This is what happens when the class as a whole does not study and understand the lab. The second group will likely conduct the experiment on Wednesday, seeing as more than just I study. Wishing luck to everyone on their pre-lab quiz on Wednesday.

Test

Test
The test was so much easier than the pre-test. I really think that I did good on it. Hopefully, I get a good grade, I studied super hard. The test included some things from Nomenclature. There was ionic naming along with average atomic mass and finding the missing element. Alpha, Gamma, and Beta decay were all included in the test. Praying for a good grade.

Decay Activity

Decay Activity
To demonstrate half-lives, we cut up a piece of paper into 567 tiny squares. we put the squares in a cup and shook it up. If the paper landed on the color side, we counted them as decayed particles. This went on for quite a while until we had barely any active particles left. It was a very helpful tool to learn half-lives.